Fix: Uncomment modal dependency (required by agents.py)

requirements.txt

@@ -15,7 +15,7 @@ huggingface_hub==0.24.6  # Explicitly pin to version with HfFolder
 # Blaxel (Default) - No extra pip packages needed, uses HTTP
 
 # Optional backends (install if using)
-# modal>=0.63.0               # For Modal backend
+modal>=0.63.0               # For Modal backend - REQUIRED even if not primary (imported in agents.py)
 # google-generativeai>=0.3.0  # For Gemini backend
 # openai>=1.0.0               # For OpenAI backend